\documentclass{article}
\usepackage[usenames,dvipsnames]{xcolor}
\usepackage{tcolorbox}
\usepackage{tabularx}
\usepackage{array}
\usepackage{colortbl}
\tcbuselibrary{skins}

\newcolumntype{Y}{>{\raggedleft\arraybackslash}X}

\tcbset{tab1/.style={fonttitle=\bfseries\large,fontupper=\normalsize\sffamily,
			colback=yellow!10!white,colframe=red!75!black,colbacktitle=Salmon!40!white,
			coltitle=black,center title,freelance,frame code={
					\foreach \n in {north east,north west,south east,south west}
						{\path [fill=red!75!black] (interior.\n) circle (3mm); };},}}

\tcbset{tab2/.style={enhanced,fonttitle=\bfseries,fontupper=\normalsize\sffamily,
			colback=yellow!10!white,colframe=red!50!black,colbacktitle=Salmon!40!white,
			coltitle=black,center title}}

\begin{document}

\begin{tcolorbox}[tab2,tabularx={X||Y|Y|Y|Y||Y}]
	Group & One     & Two     & Three    & Four     & Sum      \\\hline\hline
	Red   & 1000.00 & 2000.00 & 3000.00  & 4000.00  & 10000.00 \\\hline
	Green & 2000.00 & 3000.00 & 4000.00  & 5000.00  & 14000.00 \\\hline
	Blue  & 3000.00 & 4000.00 & 5000.00  & 6000.00  & 18000.00 \\\hline\hline
	Sum   & 6000.00 & 9000.00 & 12000.00 & 15000.00 & 42000.00
\end{tcolorbox}

\begin{tcolorbox}[tab2,tabularx={X||Y|Y|Y|Y||Y},title=My table,boxrule=0.5pt]
	Group  & One     & Two     & Three    & Four     & Sum      \\\hline\hline
	Red    & 1000.00 & 2000.00 & 3000.00  & 4000.00  & 10000.00
	\Green & 2000.00 & 3000.00 & 4000.00  & 5000.00  & 14000.00
	\Blue  & 3000.00 & 4000.00 & 5000.00  & 6000.00  & 18000.00 \\\hline\hline
	Sum    & 6000.00 & 9000.00 & 12000.00 & 15000.00 & 42000.00
\end{tcolorbox}

\begin{tcolorbox}[tab1,tabularx={X||YYYY||Y}]
	Group  & One     & Two     & Three    & Four     & Sum      \\\hline\hline
	Red    & 1000.00 & 2000.00 & 3000.00  & 4000.00  & 10000.00
	\Green & 2000.00 & 3000.00 & 4000.00  & 5000.00  & 14000.00
	\Blue  & 3000.00 & 4000.00 & 5000.00  & 6000.00  & 18000.00 \\\hline\hline
	Sum    & 6000.00 & 9000.00 & 12000.00 & 15000.00 & 42000.00
\end{tcolorbox}

\end{document}
